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A router typically goes through five steps when booting up: 1 The router loads and runs POST (located in ROM), testing its hardware components, including memory and interfaces
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2 The bootstrap program is loaded and executed 3 The bootstrap program finds and loads an IOS image: Possible locations of the IOS image include flash, a TFTP server, or the Mini-IOS in ROM 4 Once the IOS is loaded, the IOS attempts to find and load a configuration file, which is normally stored in NVRAM if the IOS cannot find a configuration file, it starts up the System Configuration Dialog 5 After the configuration is loaded, you are presented with the CLI interface (remember that the first mode you are placed into is User EXEC mode)
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1601 The CD contains a multimedia demonstration of booting up a Cisco router If you are connected to the console line, you ll see the following output as your router boots up:
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System Bootstrap, Version 110(10c), SOFTWARE Copyright (c) 1986-1996 by cisco Systems 2500 processor with 6144 Kbytes of main memory F3: 5593060+79544+421160 at 0x3000060 Cisco Internetwork Operating System Software IOS (tm) 2500 Software (C2500-I-L), Version 120(5) Copyright (c) 1986-1999 by cisco Systems, Inc Compiled Tue 15-Jun-99 19:49 by phanguye Image text-base: 0x0302EC70, data-base: 0x00001000 cisco 2504 (68030) processor (revision N) with 6144K/2048K bytes of memory Processor board ID 18086269, with hardware revision 00000003 Bridging software X25 software, Version 300 Basic Rate ISDN software, Version 11 2 Ethernet/IEEE 8023 interface(s) 2 Serial network interface(s) 32K bytes of non-volatile configuration memory 16384K bytes of processor board System flash (Read ONLY) 00:00:22: %LINK-3-UPDOWN: Interface Ethernet0, changed state to up
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16: Initial Router Con guration
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00:00:22: %LINK-3-UPDOWN: Interface Ethernet1, changed state to up Cisco Internetwork Operating System Software IOS (tm) 2500 Software (C2500-I-L), Version 120(5) Copyright (c) 1986-1999 by cisco Systems, Inc Compiled Tue 15-Jun-99 19:49 by phanguye Press RETURN to get started!
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You should notice a few things about this output First, notice that the router is loading the bootstrap program System Bootstrap, Version 110(10c) and then the IOS image IOS (tm) 2500 Software (C2500-I-L), Version 120(5) During the bootup process, you cannot see the actual POST process (unlike Catalyst switches) However, you will see information about the interfaces going up and/or down this is where the IOS is loading the configuration and bringing up those interfaces that you previously activated Sometimes, if the router has a lot of interfaces, the Press RETURN to get started! message is mixed in with the interface messages Once the display stops, just press ENTER to access User EXEC mode This completes the bootup process of the router
When a router boots up, it runs POST, loads the bootstrap program,
nds and loads the IOS, and loads its con guration le in that order
Bootstrap Program
As you saw in the bootup code example, the bootstrap program went out and found the IOS and loaded it The bootstrap program goes through the following steps when trying to locate and load the IOS image: 1 Examine the configuration register value This value is a set of four hexadecimal digits The last digit affects the bootup process If the last digit is between 0x2 and 0xF, then the router proceeds to the next step Otherwise, the router uses the values shown in Table 16-1 to determine how it should proceed next
Router Bootup Process
2 Examine the configuration file in NVRAM for boot system commands, which tell the bootstrap program where to find the IOS These commands are shown in the following paragraph 3 If no boot system commands are found in the configuration file in NVRAM, use the first valid IOS image found in flash 4 If there are no valid IOS images in flash, generate a TFTP local broadcast to locate a TFTP server (this is called a netboot and is not recommended because it is very slow and not very reliable for large IOS images) 5 If no TFTP server is found, load the Mini-IOS in ROM (RXBOOT mode) 6 If there is a Mini-IOS in ROM, then the Mini-IOS is loaded and you are taken into RXBOOT mode; otherwise, the router either retries finding the IOS image or loads ROMMON and goes into ROM Monitor mode Table 16-1 contains the three common configuration register values in the fourth hex character of the configuration register that are used to influence the bootup process The con guration register The values in the configuration register are is used to in uence how the IOS boots up represented in hexadecimal, the register being Remember the values in Table 16-1 16 bits long For step 2 of the bootup process, here are the boot system commands that you can use to influence the order that the bootstrap program should use when trying to locate the IOS image:
Router(config)# boot system flash name_of_IOS_file_in_flash Router(config)# boot system tftp IOS_image_name IP_address_of_server Router(config)# boot system rom
TABLE 16-1
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